Calf Stomach

Grossest Ingredients

If you found out that calf stomach was mixed into your hotdog or hamburger, you'd probably be a bit grossed out, but it wouldn't be too unexpected -- we all know it's better not to find out exactly what your hotdog consists of.

But rennet is not found in meat. It's actually most commonly found in cheese. That's why it's such a huge revelation for many vegetarians who have been eating a young cow's fourth stomach without knowing it.

In the UK, all cheeses are labelled as either suitable or not suitable for vegetarians, dependent on whether or not they contain rennet. Most of North America doesn't do this, and vegetarians are left wondering whether or not their cheese is suitable to eat -- or they eat it without knowing at all.